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There is no way to prevent someone from clicking the "Like" button on a Facebook page, and there is no way to prevent people from commenting on posts to your Page.

If someone does comment on your Page you can click the X to the right of their post and choose "Delete and Ban User". But you'd have to constantly watch the page to do that for every comment that comes in-- and that's not manually feasible.

Create a Custom Tab. You may need to use a third-party service to do
this, unless you are fairly technical. Examples of companies that provide these services include

the low-end with limited features and service (Google "ShortStack") but with a free version of their product that might just do what you're looking for,

and the high-end with lots of features, power, and a whole platform to use for managing your Facebook Page/Pages and tabs but with no free version (Google "Vitrue", who happens to be my employer and awesome)